reserve-righthand-alt-key

This Common Graphics configuration option specifies how the right-hand
Alt key is handled. This key is sometimes known as the AltGr key,
especially on European keyboards.

If the value is nil, then Common Graphics
handles the righthand Alt key as a regular Alt key, just as it does
for the lefthand Alt key. Keystrokes with this key held down will
call virtual-key-down methods
as usual, or invoke menu commands whose event-synonym shortcuts
use alt-key.

If the value is true, then Common Graphics will not handle keystrokes
at all when the righthand Alt key is held down, and will instead pass
the keystrokes directly back to the Windows operating system. This is
needed with some keyboards for entering characters for which the
keyboard does not have dedicated keys.

The default value is true, to allow the AltGr key to be used for
alternate character input by default. In releases prior to 8.2,
this option did not exist and the behavior was as if its value were
nil. The following form sets the option
to nil:

(setf (reserve-righthand-alt-key (configuration *system*)) nil)

Copyright (c) 1998-2012, Franz Inc. Oakland, CA., USA. All rights reserved.Documentation for Allegro CL version 8.2. This page is new in the 8.2 release.Created 2010.1.21.